pre installed software inspiron 6400

i purchased a new inspiron from dell last december with the free vista upgrade had lots of problems and ended in a crash so contacted dell talked me through the system recovery and went back to XP media centre only to find all the pre installed software had gone and seeing as though there was no cd with this on can anyone tell me where i can get a cd with it on as dell do not seemed to bothered all help gratefully recieved thank you